docs/intro/overview.rst: add example of scraped data and introduce loaders
docs/intro/overview.rst: add example of scraped data and introduce loaders

liyy7/scrapy,barraponto/scrapy,zorojean/scrapy,olafdietsche/scrapy,starrify/scrapy,yusofm/scrapy,olorz/scrapy,Chenmxs/scrapy,arush0311/scrapy,jdemaeyer/scrapy,hansenDise/scrapy,ylcolala/scrapy,ssteo/scrapy,nowopen/scrapy,Timeship/scrapy,pawelmhm/scrapy,wangjun/scrapy,dangra/scrapy,wangjun/scrapy,olafdietsche/scrapy,YeelerG/scrapy,elijah513/scrapy,hbwzhsh/scrapy,yarikoptic/scrapy,dacjames/scrapy,Preetwinder/scrapy,farhan0581/scrapy,Parlin-Galanodel/scrapy,cyberplant/scrapy,JacobStevenR/scrapy,dgillis/scrapy,Lucifer-Kim/scrapy,JacobStevenR/scrapy,kashyap32/scrapy,raphaelfruneaux/scrapy,yarikoptic/scrapy,fontenele/scrapy,olorz/scrapy,livepy/scrapy,ENjOyAbLE1991/scrapy,fontenele/scrapy,ArturGaspar/scrapy,webmakin/scrapy,huoxudong125/scrapy,Slater-Victoroff/scrapy,Cnfc19932/scrapy,eliasdorneles/scrapy,jiezhu2007/scrapy,ssh-odoo/scrapy,dgillis/scrapy,Zephor5/scrapy,CodeJuan/scrapy,kalessin/scrapy,Lucifer-Kim/scrapy,yusofm/scrapy,dangra/scrapy,mgedmin/scrapy,kazitanvirahsan/scrapy,AaronTao1990/scrapy,famorted/scrapy,Geeglee/scrapy,cleydson/scrapy,Preetwinder/scrapy,Partoo/scrapy,agusc/scrapy,starrify/scrapy,ArturGaspar/scrapy,redapple/scrapy,Lucifer-Kim/scrapy,Cnfc19932/scrapy,finfish/scrapy,darkrho/scrapy-scrapy,YeelerG/scrapy,pranjalpatil/scrapy,jc0n/scrapy,jdemaeyer/scrapy,Digenis/scrapy,mlyundin/scrapy,gbirke/scrapy,joshlk/scrapy,moraesnicol/scrapy,famorted/scrapy,codebhendi/scrapy,gnemoug/scrapy,wujuguang/scrapy,csalazar/scrapy,legendtkl/scrapy,Bourneer/scrapy,github-account-because-they-want-it/scrapy,tagatac/scrapy,rahul-c1/scrapy,starrify/scrapy,stenskjaer/scrapy,xiao26/scrapy,1yvT0s/scrapy,jc0n/scrapy,rootAvish/scrapy,scorphus/scrapy,Preetwinder/scrapy,lacrazyboy/scrapy,crasker/scrapy,cyrixhero/scrapy,GregoryVigoTorres/scrapy,emschorsch/scrapy,elacuesta/scrapy,Timeship/scrapy,1yvT0s/scrapy,hbwzhsh/scrapy,jamesblunt/scrapy,foromer4/scrapy,fqul/scrapy,Djlavoy/scrapy,Bourneer/scrapy,wzyuliyang/scrapy,kmike/scrapy,AaronTao1990/scrapy,webmakin/scrapy,ylcolala/scrapy,rahul-c1/scrapy,tagatac/scrapy,amboxer21/scrapy,darkrho/scrapy-scrapy,pablohoffman/scrapy,profjrr/scrapy,shaform/scrapy,chekunkov/scrapy,coderabhishek/scrapy,mouadino/scrapy,nguyenhongson03/scrapy,wenyu1001/scrapy,elacuesta/scrapy,CENDARI/scrapy,liyy7/scrapy,IvanGavran/scrapy,zhangtao11/scrapy,elacuesta/scrapy,sigma-random/scrapy,rolando-contrib/scrapy,Slater-Victoroff/scrapy,cyberplant/scrapy,sardok/scrapy,kalessin/scrapy,yidongliu/scrapy,legendtkl/scrapy,jorik041/scrapy,legendtkl/scrapy,hwsyy/scrapy,zhangtao11/scrapy,tntC4stl3/scrapy,arush0311/scrapy,pombredanne/scrapy,stenskjaer/scrapy,songfj/scrapy,WilliamKinaan/scrapy,tliber/scrapy,haiiiiiyun/scrapy,pablohoffman/scrapy,rklabs/scrapy,KublaikhanGeek/scrapy,agreen/scrapy,rahulsharma1991/scrapy,agusc/scrapy,foromer4/scrapy,URXtech/scrapy,huoxudong125/scrapy,yusofm/scrapy,johnardavies/scrapy,shaform/scrapy,sardok/scrapy,yidongliu/scrapy,amboxer21/scrapy,dhenyjarasandy/scrapy,CodeJuan/scrapy,KublaikhanGeek/scrapy,Cnfc19932/scrapy,dacjames/scrapy,OpenWhere/scrapy,cyrixhero/scrapy,Geeglee/scrapy,lacrazyboy/scrapy,umrashrf/scrapy,joshlk/scrapy,nfunato/scrapy,darkrho/scrapy-scrapy,CENDARI/scrapy,jc0n/scrapy,Allianzcortex/scrapy,bmess/scrapy,curita/scrapy,fpy171/scrapy,umrashrf/scrapy,yarikoptic/scrapy,mlyundin/scrapy,wzyuliyang/scrapy,TarasRudnyk/scrapy,fontenele/scrapy,Digenis/scrapy,zorojean/scrapy,avtoritet/scrapy,dracony/scrapy,TarasRudnyk/scrapy,ashishnerkar1/scrapy,fpy171/scrapy,nguyenhongson03/scrapy,aivarsk/scrapy,z-fork/scrapy,tliber/scrapy,smaty1/scrapy,nowopen/scrapy,zackslash/scrapy,irwinlove/scrapy,jdemaeyer/scrapy,rklabs/scrapy,pombredanne/scrapy,pfctdayelise/scrapy,GregoryVigoTorres/scrapy,cyrixhero/scrapy,tntC4stl3/scrapy,beni55/scrapy,hyrole/scrapy,GregoryVigoTorres/scrapy,Digenis/scrapy,ssh-odoo/scrapy,OpenWhere/scrapy,Adai0808/scrapy-1,nikgr95/scrapy,CodeJuan/scrapy,pfctdayelise/scrapy,cursesun/scrapy,pawelmhm/scrapy,hbwzhsh/scrapy,cleydson/scrapy,joshlk/scrapy,wujuguang/scrapy,redapple/scrapy,WilliamKinaan/scrapy,fafaman/scrapy,OpenWhere/scrapy,olafdietsche/scrapy,Chenmxs/scrapy,w495/scrapy,Djlavoy/scrapy,hyrole/scrapy,heamon7/scrapy,w495/scrapy,jorik041/scrapy,codebhendi/scrapy,olorz/scrapy,carlosp420/scrapy,johnardavies/scrapy,pawelmhm/scrapy,profjrr/scrapy,eliasdorneles/scrapy,eLRuLL/scrapy,finfish/scrapy,raphaelfruneaux/scrapy,profjrr/scrapy,mlyundin/scrapy,Allianzcortex/scrapy,Ryezhang/scrapy,CENDARI/scrapy,rahul-c1/scrapy,cursesun/scrapy,snowdream1314/scrapy,nikgr95/scrapy,IvanGavran/scrapy,hwsyy/scrapy,ssteo/scrapy,TarasRudnyk/scrapy,rklabs/scrapy,heamon7/scrapy,scrapy/scrapy,gnemoug/scrapy,sigma-random/scrapy,scrapy/scrapy,fqul/scrapy,ssteo/scrapy,webmakin/scrapy,codebhendi/scrapy,scorphus/scrapy,songfj/scrapy,Partoo/scrapy,coderabhishek/scrapy,snowdream1314/scrapy,IvanGavran/scrapy,fafaman/scrapy,eLRuLL/scrapy,bmess/scrapy,rolando/scrapy,AaronTao1990/scrapy,emschorsch/scrapy,famorted/scrapy,github-account-because-they-want-it/scrapy,Ryezhang/scrapy,mgedmin/scrapy,eliasdorneles/scrapy,JacobStevenR/scrapy,crasker/scrapy,kashyap32/scrapy,kazitanvirahsan/scrapy,hansenDise/scrapy,Zephor5/scrapy,elijah513/scrapy,ndemir/scrapy,nett55/scrapy,wangjun/scrapy,kimimj/scrapy,nowopen/scrapy,hwsyy/scrapy,rolando-contrib/scrapy,dacjames/scrapy,wujuguang/scrapy,xiao26/scrapy,barraponto/scrapy,Slater-Victoroff/scrapy,nguyenhongson03/scrapy,rolando/scrapy,w495/scrapy,Bourneer/scrapy,hyrole/scrapy,chekunkov/scrapy,barraponto/scrapy,hectoruelo/scrapy,tagatac/scrapy,avtoritet/scrapy,hectoruelo/scrapy,nett55/scrapy,Parlin-Galanodel/scrapy,pablohoffman/scrapy,haiiiiiyun/scrapy,godfreyy/scrapy,nett55/scrapy,Zephor5/scrapy,cleydson/scrapy,agreen/scrapy,songfj/scrapy,Ryezhang/scrapy,Timeship/scrapy,wzyuliyang/scrapy,shaform/scrapy,jorik041/scrapy,fafaman/scrapy,devGregA/scrapy,nfunato/scrapy,raphaelfruneaux/scrapy,Chenmxs/scrapy,Allianzcortex/scrapy,agusc/scrapy,hectoruelo/scrapy,dangra/scrapy,eLRuLL/scrapy,kashyap32/scrapy,kmike/scrapy,scrapy/scrapy,Adai0808/scrapy-1,jeffreyjinfeng/scrapy,wenyu1001/scrapy,beni55/scrapy,Parlin-Galanodel/scrapy,farhan0581/scrapy,kalessin/scrapy,rahulsharma1991/scrapy,huoxudong125/scrapy,dracony/scrapy,zjuwangg/scrapy,hansenDise/scrapy,devGregA/scrapy,smaty1/scrapy,pombredanne/scrapy,curita/scrapy,godfreyy/scrapy,nfunato/scrapy,ENjOyAbLE1991/scrapy,farhan0581/scrapy,ramiro/scrapy,wenyu1001/scrapy,rahulsharma1991/scrapy,avtoritet/scrapy,rolando-contrib/scrapy,z-fork/scrapy,ArturGaspar/scrapy,ylcolala/scrapy,ashishnerkar1/scrapy,ramiro/scrapy,jamesblunt/scrapy,livepy/scrapy,smaty1/scrapy,irwinlove/scrapy,chekunkov/scrapy,rdowinton/scrapy,agreen/scrapy,haiiiiiyun/scrapy,Adai0808/scrapy-1,aivarsk/scrapy,dracony/scrapy,foromer4/scrapy,xiao26/scrapy,kmike/scrapy,finfish/scrapy,fqul/scrapy,WilliamKinaan/scrapy,pranjalpatil/scrapy,taito/scrapy,godfreyy/scrapy,moraesnicol/scrapy,github-account-because-they-want-it/scrapy,devGregA/scrapy,taito/scrapy,stenskjaer/scrapy,mgedmin/scrapy,bmess/scrapy,scorphus/scrapy,zorojean/scrapy,beni55/scrapy,elijah513/scrapy,crasker/scrapy,kimimj/scrapy,umrashrf/scrapy,yidongliu/scrapy,dhenyjarasandy/scrapy,heamon7/scrapy,johnardavies/scrapy,gbirke/scrapy,jiezhu2007/scrapy,livepy/scrapy,snowdream1314/scrapy,1yvT0s/scrapy,kazitanvirahsan/scrapy,jiezhu2007/scrapy,YeelerG/scrapy,curita/scrapy,URXtech/scrapy,taito/scrapy,rootAvish/scrapy,dgillis/scrapy,emschorsch/scrapy,KublaikhanGeek/scrapy,moraesnicol/scrapy,fpy171/scrapy,redapple/scrapy,tntC4stl3/scrapy,coderabhishek/scrapy,mouadino/scrapy,amboxer21/scrapy,dhenyjarasandy/scrapy,ENjOyAbLE1991/scrapy,csalazar/scrapy,cursesun/scrapy,nikgr95/scrapy,ndemir/scrapy,zackslash/scrapy,irwinlove/scrapy,rolando/scrapy,carlosp420/scrapy,arush0311/scrapy,jeffreyjinfeng/scrapy,cyberplant/scrapy,rdowinton/scrapy,aivarsk/scrapy,pfctdayelise/scrapy,pranjalpatil/scrapy,jeffreyjinfeng/scrapy,Geeglee/scrapy,zhangtao11/scrapy,rdowinton/scrapy,Djlavoy/scrapy,rootAvish/scrapy,zjuwangg/scrapy,kimimj/scrapy,zackslash/scrapy,liyy7/scrapy,URXtech/scrapy,ramiro/scrapy,lacrazyboy/scrapy,Partoo/scrapy,z-fork/scrapy,zjuwangg/scrapy,tliber/scrapy,csalazar/scrapy,ssh-odoo/scrapy,carlosp420/scrapy